244 



MEMOIRS OP THE UNIVERSITY OF CALIFORNIA. 



mens available in the collections from Rancho La Brea the individuals unques- 

 tionably included in the species referred to C. dims show considerable range 

 of size and form. The Mexican species falls well within the range of variation 

 of the Rancho La Brea specimens. The marked angle in the forehead of the 

 Mexican specimen, formed by the sharp downward slope of the f ronto-maxillary 

 region above the orbit, is matched by the contour of the skull in several speci- 

 mens representing old individuals from Rancho La Brea. 



Comparison ivitlfi Previously Described Calif ornian Material. The speci- 

 mens already described from California, comprising the mandible from Liver- 

 more Valley 19 and the fragment of a lower jaw from Tulare County 20 , may both 

 presumably be included within the limits of Canis dims. The jaw from Liver- 



Fig. 25. Canis dirus Leidy. 

 LeWy. 



Right ramus of mandible, X 



Livermore Valley, California. Adapted from 



more Valley (fig. 25), as shown by the table of measurements below, is closely 

 similar in dimensions to specimens from Rancho La Brea. The specimen from 

 Tulai'e County (fig. 26) seemed to show a somewhat heavier jaw than the 



Fig. 26. Canis dirus Leidy. A portion of the left ramus of the mandible, X %. Oil Springs, Oil Canon, 

 Tulare County, California. 



i Leidy, J., Geol. Surv. Terrs., vol. i, Foss. Verts, p. 230, 1873. 



20 Merriam, J. C., Univ. Calif. Publ. Bull. Dept. Geol., vol. 3, no. 14, p. 288, 1903. 



